having conditions will make it slow too, probably even slower.

the code is readable however the code provided here is not efficiant guys as the complexity is O(n * 3). as here we loop three times instead we can use one loop with three condition and make the complexity to be O(n).

It's readablle, but where is the 'Best Practices' in this solution?

good but slow

Very readable. Let the machine work, not a man.